Unfortunately, it looks like Blizzard has nerfed the XP you get from doing all of the WQ pet battles in BfA, so these strats for leveling are now pointless. I'm glad I got a chance to boost some pets before they decided not to let us do it anymore...

This strat with 2 level pets works aswell with the Nether Faerie Dragon with Arcane Blast, Life Exchange and Cyclone. I combined this strat with the one from Clarx (alternative number 4 with the Sprite Darter Hatchling, the Nether Fearie Dragon is the alternative pet for the Sprite Darter Hatchling)

It was close, but my S/B got it done. I did throw in two flame breaths, first one just after first Great Sting, to have four rounds of continuous damage, and again after second Great Sting then cleaved to the finish.